From: Peter Silcock <peter@fastmail.uk>
To: Guile Mailing List <guile-user@gnu.org>
Subject: Request for assistance: (assertion-violation) unbound variable
Date: Thu, 08 Jun 2017 11:28:57 +0100 [thread overview]
Message-ID: <1496917737.4841.1.camel@fastmail.uk> (raw)
As a newcomer to Guile/Scheme, I am working my way through some
exercises which require the use of an (assertion-violation) procedure
to trap an error condition, specifically:
(if (empty? queue)
(assertion-violation 'getq "Queue is empty")))
When I run the code (which I have checked with the answer given in the
book), I am presented with the following output: "In procedure module-
lookup: Unbound variable: assertion-violation."
So far I have found no pointers to a solution in the reference manual
or on the web. My assumption is that I am missing a module or library
from somewhere, but don't know how to set about identifying it. Chicken
Scheme also responds with the same error.
Guile version 2.0.13 on Debian Stretch 4.9.0-3-amd64.
Any suggestions please? Thanks in anticipation,
Peter Silcock
next reply other threads:[~2017-06-08 10:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-08 10:28 Peter Silcock [this message]
[not found] ` <CABPkNKk9Nm2GQ9=Su-B8jKrNsAwcow5FRqwOcz4dcCKQ3c7ELQ@mail.gmail.com>
2017-06-08 11:40 ` Request for assistance: (assertion-violation) unbound variable Peter Silcock
2017-06-11 6:23 ` Alex Vong
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